Dense integration of solvent-free electrodes for Li-ion supercabattery with boosted low temperature performance

Zhou, Haitao; Liu, Menghao; Gao, Hongquan; Hou, Dong; Yu, Chongchen; Liu, Chao; Zhang, Dong; Wu, Jianchun; Yang, Jianhong; Chen, De

doi:10.1016/j.jpowsour.2020.228553

Cited by 33 publications

(31 citation statements)

References 48 publications

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“…Recently, a solvent-free process in a pilot stage was reported, combining a high-speed air blowing and rolling process, which can make the free-standing film at relatively low temperature. [20] Hence, in this study, this solvent-free process was used to fabricate a high-crystalized, thin (≈35 µm) and dense (≈9% porosity after cycling) lithiated-PPS based solid-state separator (PPS-SSS) (Figure S1, Supporting Information). Trace of dualsalt LiDFOB/LiBF 4 liquid electrolyte (4 µL mAh −1 ) was added to infiltrate the electrodes and PPS-SSSs, which showed higher conductivity (>10 −4 S cm −1 ) and diffusion rate in bulk and interface at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Polyphenylene Sulfide‐Based Solid‐State Separator for Limited Li Metal Battery

Zhou

Gao

et al. 2021

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shortages put forward serious challenges to modern energy storage methods. [1] Under such circumstances, lithium-ion batteries (LIBs) have become more and more widely used in energy storage due to their advantages of high energy density and cycle life. [2] However, conventional LIBs usually use a large amount of flammable, explosive, and volatile organic liquid electrolytes, leading to serious safety problems in use. [3] Moreover, the state-of-the-art LIBs are insatiable in the rising demand for higher energy density. Advanced LIBs based on Li metal anodes (LMBs) could provide higher energy density and become a hot research topic. [4] But the "dead" Li and poor cycling caused by uncontrolled growth of Li dendrites also limit the development of the LMBs.By using solid-state electrolytes (SSE) instead of traditional organic liquid electrolytes, solid-state LMBs are considered to be the most promising energy storage method. SSEs can suppress Li dendrites' formation, thereby fundamentally solving the safety and cycling issues of LMBs. [5] To achieve safe, high energy and power density and better cycle stability, the SSEs require a high diffusion rate including bulk and interface in a wide temperature range, thin and flexible electrolyte films, chemical and mechanical stabilities. However, the SSEs reported so far remain formidable challenges to meet all the above requirements. In general, SSEs can be divided into two categories: inorganic glassy or ceramic electrolytes and solid polymer electrolytes (SPEs). For instance, the inorganic solid electrolyte systems, including the garnet-type and perovskite-type ceramic materials and sulfide-type glass, have been extensively studied for the high conductivity. However, due to the brittle nature, poor processing performance, high interface resistance with the electrode, and high sensitivity to moisture for sulfides, they are still not suitable for wide commercial applications. [6] Various organic SPEs, such as the most studied polyethylene oxide (PEO), [7] the polyacrylonitrile (PAN), [8] the poly(vinylidene fluoride) (PVDF), [9] the polymethyl methacrylate (PMMA), [10] and the polypropylene oxide (PPO), [11] have improved thermal stability and flexibility. Still, their low ionic conductivities restrict the high-power operation of the battery at room temperature. One of the approaches to address above mentioned challenges is to use quasi-solid route by adding the liquid electrolytes (organic solvents or ionic liquid)The urgent need for high energy batteries is pushing the battery studies toward the Li metal and solid-state direction, and the most central question is finding proper solid-state electrolyte (SSE). So far, the recently studied electrolytes have obvious advantages and fatal weaknesses, resulting in indecisive plans for industrial production. In this work, a thin and dense lithiated polyphenylene sulfide-based solid state separator (PPS-SSS) prepared by a solvent-free process in pilot stage is proposed. Moreover, the PPS surface is functionalized to immobilize the...

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Section: Introductionmentioning

confidence: 99%

Polyphenylene Sulfide‐Based Solid‐State Separator for Limited Li Metal Battery

Zhou

Gao

et al. 2021

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“…Here, 5 wt% Li2C2O4 in LNMO cathode was used for the Li-compensating and plating on Cu. Due to the deliquescent character of Li2C2O4, the solve-free electrode process 21 was used to fabricated the free-standing LNMO film ( Fig. 4d and Movie S5) and final LNMO cathode (P=1.5 mAh cm -2 ).…”

Section: Metal Battery With Limited Li-plating Cu Anodementioning

confidence: 99%

“…The Li-plating on Cu foil was performed by using gavanostatic charge, and the LiFePO4 (LFP) cathodes were used as the Li source and positive electrode, as illustrated in Figure S9. Solvent-free electrode process was adoped to fabricating the thick LiFePO4 electrode with high-loadings up to 10 mAh cm -2 , as we reported recently 21 . The Li-plating currents from 0.25 to 2 mA cm -2 were used in this work.…”

Section: Li-platingmentioning

confidence: 99%

“…Recently, we reported a solvent-free process in a pilot stage, combining a high-speed air blowing and rolling process, which can make the free-standing film at relatively low temperature 21 . Hence, in this study, we used this solvent-free process to fabricate a thin (~35 μm) and dense (~9% porosity) lithiated PPS based SPE film (PPS-SPE) with high Li loading of 3 wt%.…”

Section: Introductionmentioning

confidence: 99%

“…All the HVLCO cathode with high areal capacity of 2.2 and 3.5 mAh cm -2 and NCM523 cathode with 3 mAh cm -2 were supplied by ) Co., Ltd.. The LiNi0.5Mn1.5O4 (LNMO) cathode was fabricated by the solvent-free process, as we reported recently21 . The free-standing film contained 75 wt% LNMO (Wujie Science and Technology Co., LTD), 5 wt% Li2C2O4, 12 wt% carbon materials, and 8 wt% fiberized PTFE.The film was rolled several times at 130 °C to reduce the thickness to ~150 μm, as shown in Movie S. Then, the free-standing films and the graphite-protected etched Al current collectors were combined together through the hot roller at 160 °C to form the LNMO cathode.…”

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Polyphenylene sulfide quasi-solid-state electrolyte for limited Li metal battery

Chen¹,

Zhou²,

Yu³

et al. 2021

Preprint

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The urgent need for safe and high energy batteries is pushing the battery studies towards the solid-state direction, and the most central question is finding proper solid-state electrolyte. So far, the recently studied electrolyte systems have obvious advantages and fatal weaknesses, resulting in indecisive plans for industrial production. In this work, we propose a thin and dense lithiated polyphenylene sulfide (PPS)-based solid polymer electrolyte prepared by a solvent-free process in a pilot stage. Moreover, the PPS surface is functionalized to immobilize the anions, increase the Li ion transference number to 0.8-0.9, and widen the electrochemical potential window (>5.1 V). At room temperature, the PPS-based quasi-solid electrolyte (PPS-QSSE) exhibits high intrinsic Li+ diffusion coefficient and ionic conductivity (>10-4 S cm-1), excellent thermal stability, and Li+ transport rectifying effect, resulting in homogenous Li-plating on Cu at high current density. Based on the limited Li-plated Cu anode or anode-free Cu, high loadings cathode and high voltage, the Li metal batteries with PPS-QSSEs deliver high energy density (>1000 Wh L-1) and good cycling at high power (900 W L-1) exceeding that of state-of-the-art Li-ion batteries. The results enlighten the mechanism of solid-liquid two phase conduction and promote the solid-state battery towards practicality.

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How Binder Nanofibration Affects the Active‐Material Microenvironment in Battery Electrodes?

Ma,

Cai,

Zhu

et al. 2024

Adv Funct Materials

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Binder morphology is a critical factor determining the electrode microstructures and properties, which fundamentally controls the charge transport and mechanical performance of the resultant battery. In this case, polytetrafluoroethylene (PTFE) binder is of great interest as it exhibits unique nanofibration capability and mechanical flexibility, which has been broadly applied for dry processing of battery electrodes. However, there is a lack of fundamental study on how binder nanofibration affects the electrochemomechanical properties of electrodes. Here, similar to the fibrous structures of the cell microenvironment, the attempt is to answer this question from the viewpoint of active‐material microenvironment (ME@AM). First, the PTFE nanofibration degree is adjusted by electrode calendering treatment and binder loading. Second, the microstructures, mechanical relaxation behavior, bending capability, and liquid–electrolyte wetting capability of the fibrous ME@AM are comparatively investigated in detail by dynamic mechanical testing. Finally, the superiority of highly fibrous ME@AM in electrochemical performance is confirmed by the C‐rate and cycling stability testing of half‐cells. This study indicates that a highly fibrous ME@AM can remarkably improve the electrochemomechanical properties of electrodes by enhanced capillary action with liquid electrolyte, good electrode flexibility, and structural stability under compression.

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Dense integration of solvent-free electrodes for Li-ion supercabattery with boosted low temperature performance

Cited by 33 publications

References 48 publications

Polyphenylene Sulfide‐Based Solid‐State Separator for Limited Li Metal Battery

Polyphenylene Sulfide‐Based Solid‐State Separator for Limited Li Metal Battery

Polyphenylene sulfide quasi-solid-state electrolyte for limited Li metal battery

How Binder Nanofibration Affects the Active‐Material Microenvironment in Battery Electrodes?

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